OET interlinear ISA 34:8

uW Translation Notes:

כִּ֛י

(Some words not found in UHB: that/for/because/then/when day vengeance to/for=YHWH year_of retribution for,the_cause_of Tsiyyōn/(Zion) )

The word translated as For indicates that what follows is a reason for what came before. Use a connector in your language that makes it clear that what follows is a reason for what came before. Alternate translation: [This is because]

Note 1 topic: figures-of-speech / abstractnouns

י֥וֹם נָקָ֖ם

day vengeance

If your language does not use an abstract noun for the idea of vengeance, you could express the same idea in another way. Alternate translation: [a day when Yahweh takes revenge]

Note 2 topic: figures-of-speech / abstractnouns

שְׁנַ֥ת שִׁלּוּמִ֖ים

year_of retribution

If your language does not use an abstract noun for the idea of retribution, you could express the same idea in another way. Alternate translation: [a year when he punishes them]

Note 3 topic: figures-of-speech / possession

לְ⁠רִ֥יב צִיּֽוֹן

for,the_cause_of Tsiyyōn/(Zion)

Isaiah is using the possessive form to describe a cause that is characterized by Zion. If a speaker of your language would not use the possessive form for this, you could express this idea in another way. Alternate translation: [for the cause of defending Zion]